One price. The year included.

Four quarters, one annual return, every reminder and every explanation. Kwartaal costs less than the coffee you'd drink worrying about it.

Kwartaal Proannual — most choose this

€10/month · billed yearly (€120)

Prefer flexible? €12/month, cancel any time.

Quarter checklists — the guided close, start to drawer

Annual studio — your income-tax year, explained

Money — set-aside tracking against the estimate

Vault — receipts and invoices, checked and kept 7 years

Exports + a seat for your bookkeeper

The free first quarter

Full access until you close your first quarter.

No card. Not a 14-day timer — a real milestone. You set up, work the quarter, file it, pay it, and feel the drawer close. Then you decide.

Whatever you decide, your calendar and reminders stay free, and everything you entered stays readable and exportable.

Free forever: calendar · reminders · set-aside calculator · glossary

What it really costs a ZZP'er

Kwartaal is a business expense. The btw comes back, and the rest reduces your taxable profit.

You pay / year

€120

btw back · rubriek 5b

−€20,83

off your profit

−€99 deductible

effectively

±€6–7/month

estimateFigures: tax year 2026— at a marginal rate around 40%; yours may differ.

Free — the safety layer

Deadline calendar — all four quarters + the annual return

Reminders — email, in time, in plain language

Set-aside calculator — yours / btw / reserve on any amount

Glossary — every Dutch term, explained once and dotted ever after

Pro — the understanding layer

Quarter checklists — the guided 25-minute close

Annual studio — your income-tax year, walked through

Money — set-aside tracked against the live estimate

Vault — receipts checked for the six required elements, kept 7 years

Exports & bookkeeper seat — your data travels with you